88.4 3.4 3400
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3/2-[4/ 1×3]
=3/4
[28× 1/4-5]÷5/6
= 12/5
[48+64]×[2/7÷2/3]
=48
62×45+38×45
=[62+38]×45
=4500
[ 1.25×0.8]×[4×2.5]
= 10
7/9+2/9-3/8-5/8
= 1-[3/8+5/8]
=0
3/4×72+7/9×72
= 1 10